No legal bid may be rejected unless all bids are rejected. All bids shall be rejected upon objection to award by an authorized representative of the issuing unit. If bids have been rejected, another notice of sale shall be given and further bids invited. (1931, ch. 60, s. 18; 1935, c. 356, s. 1; 1939, c. 231, s. 3; 1971, c. 780, s. 1.)